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Read the problem carefully and see source code.

#include<stdio.h>
#include<stdlib.h>
int parity;
char b[50];
int i;
void checkParity(long int n)
{
   i=0;
   parity=0;
   if(n)
    {
       checkParity(n/2);
       b[i]=n%2+'0';
       if(b[i]=='1')
     parity++;
 
      i++;
 
     }
     b[i]='\0';
}
 
int main()
{
    long int n,i;
 
     while(1)
     {
        scanf("%ld",&n);
          if(n==0)
        break;
      else
      {
             checkParity(n);
      }
 
      printf("The parity of %s is %d (mod 2).\n",b,parity);
     }
    return 0;
}

 

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